Best airline I've known to handle cabin bags is KLM. E.g on the F70 if the flight is booked to over 60 then all the trolley cases apart from those in business or with frequent flyer cards get taken at the gate and tagged for the hold as DAA bags. These are then taken off in AMS first before the pax are allowed to disembark and they collect these as they disembark. Sounds complicated but works a treat. Never any issue with arguments why my bag cos everyone's is taken and it doesn't take extra time as it's normally done at check in or at the gate before boarding, the passengers even put their own bags on the bag trolley for the ramp lads if on a non airbridge stand.